Question

а) 3/5 * 4/9 =
Б) 7/9 : 21/25
В) 3 5/6 + 2 7/15
А) 4 1/6 * 3 3/5
В)3 5/6 + 2 7/15 - 1 29/30

Answer 1

а) 3/5 * 4/9 = (3*4)/(5*9) = 4/(5*3) = 4/15
Б) 7/9 : 21/25 = 7/9 * 25/21 = (7*25)/(9*21) = (25)/(9*3) = 25/27
В) 3 5/6 + 2 7/15 = 23/6 + 37/15 = (5*23+37*2)/30 = (115+74)/30 = 189/30 = 6 3/10
А) 4 1/6 * 3 3/5 = 25/6 * 18/5 = (25*18)/(6*5) = 5*3 = 15
В)3 5/6 + 2 7/15 - 1 29/30 = 23/6 + 37/15 - 59/30 = (23*5+37*2-59)/30 = (115+74-59)/30 = 130/30 = 4 10/30 = 4 1/3